Adjustable shock absorber device for fluid pressure operated cylinders

Claim 1

A SHOCK ABSORBER DEVICE FOR FLUID PRESSURE OPERATED CYLINDERS WITH A PISTON, A CYLINDER HEAD AT LEAST AT ONE END OF THE CYLINDER AND MEANS DEFINING A DAMPING FLUID CUSHION AT LEAST AT ONE END OF THE CYLINDER, CHARACTERIZED IN THAT THE CYLINDER HEAD AND THE PISTON HAVE AT LEAST PARTIALLY COMPLEMENTARY COOPERATING PARTS ADAPTED TO DEFINE TOGETHER A SPACE FORMING A SHOCK-ABSORBING FLUID CUSHION THEREIN, WHEN THE RELATIVE POSITION BETWEEN SAID CYLINDER HEAD AND SAID PISTON IS WITHIN A PREDETERMINED INTERVAL, A DIAPHRAGM MEMBER SECURED ON SAID CYLINDER HEAD AND DEFINING A WALL OF SAID SPACE, AT LEAST ONE THROUGH-HOLE IN SAID DIAPHRAGM, A POROUS COVER MEMBER EXTENDING AT LEAST OVER THE AREA OF SAID THROUGH-HOLE AND PASSAGE MEANS PROVIDING COMMUNICATION BETWEEN THE OUTSIDE OF SAID CYLINDER AND SAID POROUS COVER MEMBER TO ALLOW LIMITED FLUID FLOW FROM SAID SPACE THROUGH SAID POROUS COVER MEMBER TOWARDS THE OUTSIDE AND VICE VERSA, AND ADJUSTING MEANS ADAPTED TO ADJUST THE POSITION OF AT LEAST ONE WALL OF SAID SPACE.